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Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
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  11. All-optical Logic Gates Based On Three-dimensional Asymmetry Modulation: From Coherent Absorption To Dynamic Key Mapping Encryption

All-optical logic gates based on three-dimensional asymmetry modulation: from coherent absorption to dynamic key mapping encryption

Xiaocheng Gu, Xiangfu Wang

    Optics Express
    |June 14, 2025

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    View abstract on PubMed

    Summary
    This summary is machine-generated.

    This study introduces novel all-optical logic gates using reconfigurable metamaterials. These devices offer multiple-input-output capabilities for advanced optical computing and secure encrypted communication.

    Area of Science:

    • Photonics and Metamaterials
    • Optical Computing
    • Information Security

    Background:

    • Existing all-optical logic gates often use single-input-output operations, limiting device functionality.
    • Metamaterials offer unique optical properties for advanced device design.

    Purpose of the Study:

    • To propose a novel stack-based reconfigurable split ring resonator (SRR) metamaterial structure for all-optical logic gates.
    • To demonstrate multiple-input-output (MIO) capabilities for enhanced optical signal processing and encryption.

    Main Methods:

    • Designing a stack-based SRR metamaterial structure to excite Fano resonance at 1.55 μm.
    • Utilizing coherent perfect absorption (CPA) for high output modulation.
    • Implementing MIO features by combining asymmetry and phase-difference modulation.

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    Main Results:

    • Achieved nearly 100% output modulation capability.
    • Demonstrated high-contrast XOR, OR, and AND logic functions.
    • Developed a dynamic key mapping (DKM) encryption scheme leveraging MIO properties.

    Conclusions:

    • The proposed MIO all-optical logic gates overcome SIO limitations, enabling versatile optical computing.
    • The DKM encryption scheme offers a novel approach to secure communication, surpassing traditional methods.
    • This work opens new avenues for digitized metasurface optical computing and information security.